// eslint-disable-next-line
const PI = 3.14159265358979324;
// eslint-disable-next-line
const xPi = 3.14159265358979324 * 3000.0 / 180.0;
// eslint-disable-next-line
export const outOfChina = function(lat: number, lon: number) {
  if (lon < 72.004 || lon > 137.8347) {
    return true;
  }
  if (lat < 0.8293 || lat > 55.8271) {
    return true;
  }
  return false;
}

// 定位数据转换逻辑
export const delta = function(lat: number, lon: number) {
  // Krasovsky 1940
  //
  // a = 6378245.0, 1/f = 298.3
  // b = a * (1 - f)
  // ee = (a^2 - b^2) / a^2;
  const a = 6378245.0; //  a: 卫星椭球坐标投影到平面地图坐标系的投影因子。
  // eslint-disable-next-line
  const ee = 0.00669342162296594323; //  ee: 椭球的偏心率。
  let dLat = transformLat(lon - 105.0, lat - 35.0);
  let dLon = transformLon(lon - 105.0, lat - 35.0);
  const radLat = lat / 180.0 * PI;
  let magic = Math.sin(radLat);
  magic = 1 - ee * magic * magic;
  const sqrtMagic = Math.sqrt(magic);
  dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * PI);
  dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * PI);
  return { lat: dLat, lon: dLon };
}

// WGS-84 to GCJ-02
export const gcj_encrypt = function(wgsLat: number, wgsLon: number) {
  if (outOfChina(wgsLat, wgsLon)) {
    return { lat: wgsLat, lon: wgsLon };
  }

  const d = delta(wgsLat, wgsLon);
  return { lat: wgsLat + d.lat, lon: wgsLon + d.lon };
}

// GCJ-02 to WGS-84
export const gcj_decrypt = function (gcjLat: number, gcjLon: number) {
  if (outOfChina(gcjLat, gcjLon)) {
    return { lat: gcjLat, lon: gcjLon };
  }

  const d = delta(gcjLat, gcjLon);
  return { lat: gcjLat - d.lat, lon: gcjLon - d.lon };
}

// GCJ-02 to WGS-84 exactly
export const gcj_decrypt_exact = function(gcjLat: number, gcjLon: number) {
  gcjLat = Number(gcjLat)
  gcjLon = Number(gcjLon)
  const initDelta = 0.01;
  const threshold = 0.000000001;
  // tslint:disable-next-line: one-variable-per-declaration
  let dLat = initDelta, dLon = initDelta;
  // tslint:disable-next-line: one-variable-per-declaration
  let mLat = gcjLat - dLat, mLon = gcjLon - dLon;
  // tslint:disable-next-line: one-variable-per-declaration
  let pLat = gcjLat + dLat, pLon = gcjLon + dLon;
  // tslint:disable-next-line: one-variable-per-declaration
  let wgsLat, wgsLon, i = 0;
  // eslint-disable-next-line
  while (1) {
    wgsLat = (mLat + pLat) / 2;
    wgsLon = (mLon + pLon) / 2;
    const tmp = gcj_encrypt(wgsLat, wgsLon);
    dLat = tmp.lat - gcjLat;
    dLon = tmp.lon - gcjLon;
    if ((Math.abs(dLat) < threshold) && (Math.abs(dLon) < threshold)) {
      break;
    }
    if (dLat > 0) {
      pLat = wgsLat;
    } else {
      mLat = wgsLat;
    }
    if (dLon > 0) {
      pLon = wgsLon;
    } else {
      mLon = wgsLon;
    }
    if (++i > 10000) {
      break;
    }
  }
  return { lat: wgsLat, lon: wgsLon };
}

// GCJ-02 to BD-09
export const bd_encrypt = function (gcjLat: any, gcjLon: any) {
  // tslint:disable-next-line: one-variable-per-declaration
  const x = gcjLon, y = gcjLat;
  const z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * xPi);
  const theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * xPi);
  const bdLon = z * Math.cos(theta) + 0.0065;
  const bdLat = z * Math.sin(theta) + 0.006;
  return { lat: bdLat, lon: bdLon };
}

// BD-09 to GCJ-02
export const bd_decrypt = function(bdLat: number, bdLon: number) {
  // tslint:disable-next-line: one-variable-per-declaration
  const x = bdLon - 0.0065, y = bdLat - 0.006;
  const z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * xPi);
  const theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * xPi);
  const gcjLon = z * Math.cos(theta);
  const gcjLat = z * Math.sin(theta);
  return { lat: gcjLat, lon: gcjLon };
}

// WGS-84 to Web mercator
// mercatorLat -> y mercatorLon -> x
export const mercator_encrypt = function (wgsLat: number, wgsLon: number) {
  // eslint-disable-next-line
  const x = wgsLon * 20037508.34 / 180.;
  // eslint-disable-next-line
  let y = Math.log(Math.tan((90. + wgsLat) * PI / 360.)) / (PI / 180.);
  // eslint-disable-next-line
  y = y * 20037508.34 / 180.;
  return { lat: y, lon: x };
  /*
  if ((Math.abs(wgsLon) > 180 || Math.abs(wgsLat) > 90))
      return null;
  let x = 6378137.0 * wgsLon * 0.017453292519943295;
  let a = wgsLat * 0.017453292519943295;
  let y = 3189068.5 * Math.log((1.0 + Math.sin(a)) / (1.0 - Math.sin(a)));
  return {'lat' : y, 'lon' : x};
  //*/
}

// Web mercator to WGS-84
// mercatorLat -> y XX -> x
/* eslint-disable */
export const mercator_decrypt = function(mercatorLat: number, mercatorLon: number) {
  const x = mercatorLon / 20037508.34 * 180.;
  let y = mercatorLat / 20037508.34 * 180.;
  y = 180 / PI * (2 * Math.atan(Math.exp(y * PI / 180.)) - PI / 2);
  return { lat: y, lon: x };
  /*
  if (Math.abs(mercatorLon) < 180 && Math.abs(mercatorLat) < 90)
      return null;
  if ((Math.abs(mercatorLon) > 20037508.3427892) || (Math.abs(mercatorLat) > 20037508.3427892))
      return null;
  let a = mercatorLon / 6378137.0 * 57.295779513082323;
  let x = a - (Math.floor(((a + 180.0) / 360.0)) * 360.0);
  let y = (1.5707963267948966 - (2.0 * Math.atan(Math.exp((-1.0 * mercatorLat) / 6378137.0)))) * 57.295779513082323;
  return {'lat' : y, 'lon' : x};
  //*/
}

// two point's distance
export const distance = function (latA: number, lonA: number, latB: number, lonB: number) {
  const earthR = 6371000.;
  const x = Math.cos(latA * PI / 180.) * Math.cos(latB * PI / 180.) * Math.cos((lonA - lonB) * PI / 180);
  const y = Math.sin(latA * PI / 180.) * Math.sin(latB * PI / 180.);
  let s = x + y;
  if (s > 1) {
    s = 1;
  }
  s = 1;
  if (s < -1) {
    s = -1;
  }
  const alpha = Math.acos(s);
  const distance = alpha * earthR;
  return distance;
}


export const transformLat = function (x: number, y: number) {
  let ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
  ret += (20.0 * Math.sin(6.0 * x * PI) + 20.0 * Math.sin(2.0 * x * PI)) * 2.0 / 3.0;
  ret += (20.0 * Math.sin(y * PI) + 40.0 * Math.sin(y / 3.0 * PI)) * 2.0 / 3.0;
  ret += (160.0 * Math.sin(y / 12.0 * PI) + 320 * Math.sin(y * PI / 30.0)) * 2.0 / 3.0;
  return ret;
}

export const transformLon = function (x: number, y: number) {
  let ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
  ret += (20.0 * Math.sin(6.0 * x * PI) + 20.0 * Math.sin(2.0 * x * PI)) * 2.0 / 3.0;
  ret += (20.0 * Math.sin(x * PI) + 40.0 * Math.sin(x / 3.0 * PI)) * 2.0 / 3.0;
  ret += (150.0 * Math.sin(x / 12.0 * PI) + 300.0 * Math.sin(x / 30.0 * PI)) * 2.0 / 3.0;
  return ret;
}


/**
 * //度分秒转换为数字经纬度
 * @param du
 * @param fen
 * @param miao
 * @returns
 */
export const changeDu = function(du: string | number, fen: string | number, miao: string | number){
  let mFen = 0;
  miao = Number(miao);
  if (miao) {
    mFen = Number(miao / 60);
  }
  let fDu = 0;
  if (fen != null && fen != '') {
    fDu = (Number(fen) + mFen) / 60;
  } else {
    fDu = mFen;
  }
  let lDu: any;
  if (du != null && du != '') {
    lDu = (Number(du) + fDu).toFixed(6);
  } else {
    lDu = fDu.toFixed(6);
  }
  const res = lDu * 1;
  return res;
}

export const formatDegree = function (value: number) {
	if(value !== null){
	    ///<summary>将度转换成为度分秒</summary>
	    value = Math.abs(value);  //返回数的绝对值
	    let v1 = Math.floor(value);//度   //对数进行下舍入
	    let v2 = Math.floor((value - v1) * 60);//分
	    let v3 = Math.round((value - v1) * 3600 % 60);//秒  //把数四舍五入为最接近的整数
	    return v1 + '°' + v2 + "'" + v3 + '"';
	}else{
		return '';
	}
};
